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S. H. DYER. SHUTTLE FOR SEWING MACHINES.

No. 583,793. Patented June 1,1897.

INVENTOH ZFWW LS1 @%w I ATTORNEY.

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UNITED STATES PATENT OFFICE.

SILAS HENRY DYER, OF PAWTUCKET, RHODE ISLAND, ASSIGNOR TO THE CAMPBELLMACHINE COMPANY, OF SAME PLACE.

SHUTTLE FOR SEWING-MACHINES.

SPECIFICATION forming part of Letters Patent No. 583,793, dated June 1,1897.

Application filed April 5, 1895.

T 0 all whom it may concern.-

Be it known that I, SILAs HENRY DYER, of Pawtucket, in the county ofProvidence and State of Rhode Island, have invented a new and usefulImprovement in Shuttles for Sewing-Machines, of which the following is aspecification, reference being had to the accompanying drawings, inwhich- Figures 1, 2, 3, and 4 are elevations of a shuttle embodying myinvention, illustrating its operation. Fig. 5 is an edge view of Fig. 1,as indicated by the arrow. Figs. 6, 7, and 8 are detached views, on alarger scale, of the slack-forming finger and boss.

My invention relates to providing slack thread between the shuttle andthe work. A variety of contrivances have been heretofore devised fordoing this, but most of them depend upon the varying distance from thework of an eye in the shuttle through which the thread passes.

In my invention the shuttle has a deliveryeye a coincident with the axisof the shuttle and a thread-finger b, so placed with relation to the eyea that as the shuttle revolves the finger will engage the shuttle-threadd and form a slack, as illustrated in Figs. 1, 2, and 5, as soon as thefinger b sheds the thread, which it does when the shuttle is in positionto shed the loop f of needle-thread, as illustrated in Fig. 3, in whichfigure the dotted line indicates the loop of needle-thread just beforethat loop is brought by the stitchtightening devices to the positionshown in full lines in that figure.

The finger b is a thread catching and re 1 Serial No. 544,527. (Nomodel.)

leasing hook, for during a portion of its revolution about thedelivery-eye of the shuttle it catches the shuttle-thread extending fromthe delivery-eye to the work, forms a bight, and carries that bightabout the delivery-eye, thereby drawing thread from the bobbin, and atthe proper point of its revolution releases that bight, thereby slackingthe thread. This thread catching and releasing hook is best formed as apart of a boss b, as clearly shown in the drawings, especially in theenlarged views, Figs. 6, 7, and 8; but my invention will be embodied inany combination of discoidal shuttle with a hook which moves around thedelivery-eye of the shuttle to catch and form a bight in theshuttle-thread and elongate and shed that bight by the motion of thehook around the delivery-eye of the discoidal shuttle.

I am aware of Patent No a65,557 to Diehl, dated December 22, 1891, andPatent No. 47 9,839 to Pearson, dated August 2, 1892, and disclaim allthat is shown in them.

What I claim as my invention is- In combination with a discoidal shuttlea thread catching and releasing hook to forma bight in theshuttle-thread between the delivery-eye of the shuttle and the work, andto shed that bight, and means to revolve that book about thedelivery-eye of the shuttle; substantially as and for the purposespecified.

sILAs HENRY. DYER.

Witnesses:

DANIEL McNIvEN, GEORGE O. EVERETT.

